Tripyla

Key to species of Tripyla

1. Tail of females and males with lateral caudal alae................................................. T. alaecaudata

- Tail of females and males without lateral caudal alae.......................................................... 2

2. Outer labial sensillae <3 µm long........................................................................ 3

- Outer labial sensillae> 3 µm long....................................................................... 12

3. Body length <0.9 mm..................................................................................4

- Body length> 0.9 mm.................................................................................. 5

4. c’ <2........................................................................................ T. pygmea

- c’> 2........................................................................................ T. minuta

5. c’ <6............................................................................................... 6

- c’> 6............................................................................................... 8

6. Body length <1.25 mm......................................................................... T. terricola

- Body length> 1.25 mm................................................................................. 7

7. Body length <2 mm............................................................................ T. cornuta

- Body length> 2 mm mm.......................................................................... T. crassa

8. Outer labial sensillae <2 μm............................................................................. 9

- Outer labial sensillae> 2 μm............................................................................ 10

9. b = 5.4–5.9; V=50–51%.................................................................... daviesae sp. nov.

- b = 4.3–5.3; V=51–56%.......................................................................... T. affinis

10. Body length <1.3 mm.......................................................................... T. koreana

- Body length> 1.3 mm.................................................................................11

11. Outer labial sensillae setiform.................................................................. T. glomerans

- Outer labial sensillae papilliform.................................................................... T. infia

12. Outer labial sensillae> 6 μm............................................................................ 24

- Outer labial sensillae 3–6 μm........................................................................... 13

13. Body length <0.9 mm......................................................................... T. pulchella

- Body length> 0.9 mm................................................................................. 14

14. c’> 20........................................................................................ T. italica

- c’ <20.............................................................................................15

15. c’ = 11–16.......................................................................................... 16

- c’ <11.............................................................................................. 17

16. a <45..................................................................................... T. filicaudata

- a> 45, c’> 12............................................................................. T. subterranea

17. a <25.............................................................................................. 18

- a> 25..............................................................................................20

18. Body length <1.5 mm................................................................................. 19

- Body length> 2 mm.............................................................................. T. dubia

19. V = 49–53%................................................................................. T. glosaria

- V = 56–60%............................................................................. T. tirau sp. nov.

20. Body length> 2.3 mm........................................................................ T. elongatula

- Body length <2.3 mm.................................................................................21

21. Outer labial setae> 4 μm.............................................................................. 22

- Outer labial setae <4 μm..............................................................................23

22. c’ <6.9....................................................................................... T. vulvata

- c’> 6.9....................................................................................... T. tropica

23. c <6.1......................................................................................... T. tenuis

- c> 6.1...................................................................................... T. aquatica

24. Body length <2.5 mm................................................................................. 25

- Body length> 2.5 mm................................................................................29

25. c’ <8.............................................................................................. 26

- c’> 8.............................................................................................. 27

26. c <8......................................................................................... T. setifera

- c> 8....................................................................................... T. napaensis

27. Body length <1.5 mm........................................................................... T. bioblitz

- Body length> 1.5 mm................................................................................. 28

28. c <5..................................................................................... T. longicaudata

- c> 5.................................................................................... T. scandinavica

29. c’> 8........................................................................................ T. sibirica

- c’ <8.............................................................................................. 30

30. a> 30........................................................................................ T. magna

- a <30..................................................................................... T. dybowski

Key for identification of species of Tripyla from the long-tailed group (c <5) (by females)

1. Tail length shorter than 430µm..................................................................................................................................... 2

– Tail length longer than 480 µm..................................................................................................................................... 4

2. The six long cephalic setae (2–4 µm) are less than ¼ of a head diameter......................................................... T. tenuis

– The six long cephalic setae (5–8 µm) are about ¼ of a head diameter......................................................................... 3

3. V = 46–53.................................................................................................................................................. T. filicaudata

– V = 44–45....................................................................................................................................................... T. bioblitz

4. Pharynx longer than 450 µm....................................................................................................................... T. dybowskii

– Pharynx shorter than 420 µm........................................................................................................................................ 5

5. Pharynx more muscular in 1/3rd of its posterior part, tail filiform............................................................................... 6

– Pharynx evenly muscular, tail not filiform................................................................................................................... 7

6. C’ = 20; body length = 2.0– 2.7 mm.................................................................................................................. T. italica

– C’ = 8-11; body length = 1.8–1.9 mm................................................................................................... T. scandinavica

7. The six long cephalic setae (3–5 µm) ca ¼ of a head diameter............................................................... T. subterranea

– The six long cephalic setae (more than 15 µm) ca 1/3 of a head diameter........................................... T. longicaudata